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9.1 The composition and evolution of the Earth's atmosphere

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Question 2
F

Coal is a fossil fuel. The figure shows the layers of rock in which a seam of coal is found.

Figure: The layers of rock in which a seam of coal is found

A labelled diagram shows a coal seam between layers of shale and sandstone beneath soil, with depth indicated by a downward arrow.

a.

Name the type of organism from which coal was formed.

[1]
b.

Describe how the remains of these organisms were changed into coal.

[3]
c.

Explain why the remains did not decay away completely.

[1]
Markscheme

9.1 The composition and evolution of the Earth's atmosphere Questions

  1. GCSE
  2. /Chemistry
  3. /9.1 The composition and evolution of the Earth's atmosphere

79 exam-style questions on AQA GCSE Chemistry 9.1 The composition and evolution of the Earth's atmosphere, covering 9.1.1 The proportions of different gases in the atmosphere, 9.1.2 The Earth's early atmosphere, 9.1.3 How oxygen increased, and 9.1.4 How carbon dioxide decreased. Each one has a worked solution and a mark scheme showing where the marks go.

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